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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9763329a2d6e4ae4dc0487affb87b94a5558883f00aee205a45efb208079330f' 
  AND token = 'KOsV+g8U4IPvnbcQ3JLXrawRQf+DfAMTjFDmuUv14mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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