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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55eddad2a5a63351fe7b5bdf290e34535815f74905a62a2f4b14a70363e6d18' 
  AND token = 'GbNA777E+sdvPxbxqeqWSbKpGPWzZFXLDUKRrn1zuHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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