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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a735747c9d5e29bcc27b3ba35ba8f5089a002b71ac5000ed055b151fc03fc5' 
  AND token = 'fvhCoqhM7p1ADtneVj/D6X7BLXx3wc/bhStQpCytL/0=' 
  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"
    }
  }
}