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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e7ce8a267ca2497e1c463c6183215f801fb1c21f96c55b35ea8189c98c2acb' 
  AND token = '2jObCPgCsDpCMgALp1/nhTP6H/Nzt7NzaPDLdV4cJOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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