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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88e11a064efedfd133985f22264b44b2d3ae6f0e2ec0bbc316d7cf22ce02898' 
  AND token = 'GvZrDFQ9rh544beMGEgckvncIc4u8Qgb0PgrGoXqjk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}