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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91402749545d87a14034d0812646da648d5521c9e4734ddbb3e3882e50c6962' 
  AND token = 'Yy2Vff01cMaj+oE2k8dSvdRPcGTr0fa49yeafIftI6c=' 
  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"
    }
  }
}