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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b475ff6fed1ba87ad57f81870c2056e281a06b4db1d8c6d44ee253bfe3a3ff' 
  AND token = 'K5IK2TPNvaBgeZbCZltXZWh+H4BsfonerL3podou4NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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