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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ea2c696a42576ab0bf700ff756cc152bfbc25d60c9956a22d3555cfd9a9711' 
  AND token = 'oUam0XbaEG6On2GKbR6HUHCIjimd+drcAX+n6VOg9WQ=' 
  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"
    }
  }
}