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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8cca8354d4d390d986cb51e8600ab4e1c675f19fcb201385145dd08992736bf' 
  AND token = 'g/Lx6XQmoeYDaRj9CqQpK3rA0IkVnmUbk8a1i3l71k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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