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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfee00ea37cdee7d4262342e3cbc893170e5c5ce7c722d554657d8a21407914a' 
  AND token = 'r1vIAkcDLZHewSKm3Aya8B4JMTTKbk8MplA9YGCTzhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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