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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c267214fe22d4406bbb24593b73961db2c3d3a6d6ad5c87a22524c08994bb25d' 
  AND token = 'db+BL5RY5zo79asfaGuz/SmCdPteh9oJK0pJTePbDMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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