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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d74473c3ce2a63e8d9929729dd21df32cdb43fb4c74a51dd5dc2e95cf8d4a7' 
  AND token = 'RjIjcgwmq/qS47g2Z30HT9DGakOer94R2RJrFWNACQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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