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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f9a85489c1ba94b8bcc092bb050978e2bead31211a61ffa73b417ea08026b5' 
  AND token = 'D0V6HS6kRTrkeae/sfMW6LEcV41W6qwWP4mG3Myy5tU=' 
  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"
    }
  }
}