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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8b1f77ce4f9410636b045f225806b63d60eb3fad91026f607e83a1048fd1f1' 
  AND token = 'pN+CpO9GMkvfZfV8+27Zhehsux9D4uwtLVSlWG24qH0=' 
  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"
    }
  }
}