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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003202fee67fcfc8a633f24bb7d1c8558a1616f664bf402f610f7af2f6299db4' 
  AND token = 'fZTWd0xzgvYLnMjPueSLEBjqjH46Px0kL4QFu2Ea+y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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