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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3d85d82aaca9f6696fbda8f0cc694d0241e2df07fd3443abad0478f03b8d34' 
  AND token = 'EayBGXH9JxbJOB7f9umyRLY/L7+wllT1g1PskGKmiMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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